Uncertainty is the essence of the human condition, and nothing is more uncertain than God. Yet passions run hot when it comes to God, both among believers and non-believers. God is a Question, Not an Answer aims to unsettle readers on both sides of the issue. William Irwin argues that because belief occurs along a continuum of doubt and we can never reach full certainty, believers and non-believers can find common ground in uncertainty. Beginning with the questions of what we mean when we talk about God and faith, Irwin shows that from a philosophical perspective, the tendency to doubt is a virtue, and from a religious perspective there is no faith without doubt. Rather than avoid uncertainty as an uncomfortable state of emotional despair, we should embrace it as an ennobling part of the human condition. We do not have to agree about the existence of God, but we do need to practice intellectual humility and learn to see doubt as a gift. By engaging in civil discourse, we can see those who disagree with us as not only fully human but capable of teaching us something.